Review- • The key benchmark indices ended a volatile trading session lower after US President Barack Obama proposed limiting risk-taking at US banks. The BSE 30-share Sensex provisionally settled 198.55 points or 1.16% lower at 16,852.59, below the psychological 17,000 mark. The S&P CNX Nifty provisionally declined 64.50 points or 1.27% to 5029.65. Nifty regained the psychological 5,000 mark soon after falling below that level at the onset of the trading session. Index heavyweight Reliance Industries (RIL) was volatile after the company today reported higher third quarter net profit.